What term is used for an order given to non-emergency aircraft to land at a specified field?

Answer: B — Divert

The term used for an order given to non-emergency aircraft to land at a specified field is "divert." This term refers to the instruction provided to pilots when they need to change their intended landing destination, often due to factors such as weather conditions, airspace restrictions, or operational requirements. Diverting ensures that the aircraft safely lands at an alternate location, maintaining air traffic flow and safety. The use of this term emphasizes the logistical aspect of air traffic control, as controllers must manage the situation efficiently and communicate effectively with pilots to ensure safe operations in the airspace. In contrast, the other terms do not specifically convey the same meaning within the context of directing a non-emergency aircraft to land elsewhere.